Observation 50394: Parmotrema gardneri (C.W. Dodge) Sérus.
When: 2010-08-10
Collection location: Sintra, Portugal [Click for map]
Who: zaca
No herbarium specimen
0 Sequences

Chemical reactions illustrated in bottom part of the last photo attached – From left to right: C on medulla; C on thallus; K on thallus (upper)/KC on thallus (down); K on medulla (upper)/KC on medulla (down).

Proposed Names

29% (1)
Recognized by sight
47% (2)
Eye3 Eyes3
Recognized by sight: no cilia, compact marginal soralia
Used references: Lichens of North America, Brodo et al., 2001, pg 480.
Based on chemical features: medulla K-, C-, KC+r

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks, Chris, for the information.
By: zaca
2010-08-17 11:24:50 PDT (-0700)

I think that (once again) Jason made a correct identification. So, my acknowledgement to her contribution.

By: Chris Parrish (kitparrish)
2010-08-16 19:15:09 PDT (-0700)

Excellent resource on the lichens of the Azores. The same Felix Schumm who took those Parmotrema photos also co-wrote the “Seychelles Lichen Guide” with Aptroot. A page in that book devoted to Parmotrema gardneri contains similar photos and the remark “Lobes eciliate or rarely sparingly ciliate.” They also report the chemistry as “Atranorin, protocetraric acid; upper cortex K+ yellow; medulla K+ dingy yellow then brown, C-, P+ orange-red.”

I took sometime to understand that
By: zaca
2010-08-16 18:19:14 PDT (-0700)

P. gardneri is not used at this zone of Europe and instead P. robustum is taken as a synonym. This species exist in Portugal (also in Spain and France), namely it was registered recently in the portuguese islands of Azores – see here.
However, from the photos presented there, one of them is very similar to my specimen but in other some cilia are visible.

By: Jason Hollinger (jason)
2010-08-16 16:14:45 PDT (-0700)

P. gardneri lacks cilia and has black underside. I have no idea if it is present in Portugal, though.

For sure is not one of the most common species of Parmotrema,
By: zaca
2010-08-16 14:39:59 PDT (-0700)

because it differs either in chemistry or by lacking cilia at the margin of lobes. So, P. gardeni is a possibility. Does P. gardeni lack cilia and have the underside of lobes completely black?

Parmotrema gardneri is just a guess
By: Jason Hollinger (jason)
2010-08-16 12:59:28 PDT (-0700)

You undoubtedly have additional species in Europe which are not present in southeastern North America.

Created: 2010-08-16 04:48:44 PDT (-0700)
Last modified: 2010-08-17 11:25:10 PDT (-0700)
Viewed: 116 times, last viewed: 2017-06-15 04:40:53 PDT (-0700)
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